]>
Commit | Line | Data |
---|---|---|
9ffbb612 UD |
1 | /* Copyright (C) 1998 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Library General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Library General Public | |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
18 | ||
19 | #include <errno.h> | |
20 | #include <sys/syscall.h> | |
21 | #include <sys/types.h> | |
22 | #include <unistd.h> | |
23 | ||
24 | #include <linux/posix_types.h> | |
25 | ||
26 | #ifdef __NR_setresuid | |
27 | extern int __setresuid (uid_t ruid, uid_t euid, uid_t suid); | |
28 | #endif | |
29 | ||
30 | int | |
31 | seteuid (uid_t uid) | |
32 | { | |
33 | int result; | |
34 | ||
35 | if (uid == (uid_t) ~0 | |
36 | || uid != (uid_t) ((__kernel_uid_t) uid)) | |
37 | { | |
38 | __set_errno (EINVAL); | |
39 | return -1; | |
40 | } | |
41 | ||
42 | /* First try the syscall. */ | |
43 | #ifdef __NR_setresuid | |
44 | result = __setresuid (-1, uid, -1); | |
45 | if (result == -1 && errno == ENOSYS) | |
46 | /* No system call available. Use emulation. This may not work | |
47 | since `setreuid' also sets the saved user ID when UID is not | |
48 | equal to the real user ID, making it impossible to switch back. */ | |
49 | #endif | |
50 | result = __setreuid (-1, uid); | |
51 | ||
52 | return result; | |
53 | } |